﻿using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Media.Imaging;

namespace RSSFeedReader.Converters
{
    /// <summary>
    /// Converter helper for Image binding.
    /// </summary>
    public class ImageNotAvailableConverter : IValueConverter
    {
        #region IValueConverter Members

        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value produced by the binding source.</param>
        /// <param name="targetType">The type of the binding target property.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>A converted value. If the method returns null, the valid null value is used.</returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return value == null ? new BitmapImage(new Uri("pack://application:,,,/RSSFeedReader.Resources;component/Images/ImageNotAvailable.jpg", UriKind.Absolute)) 
                : new BitmapImage(new Uri(value.ToString()));
        }

        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value produced by the binding source.</param>
        /// <param name="targetType">The type of the binding target property.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <exception cref="NotImplementedException"></exception>
        /// <returns>A converted value. If the method returns null, the valid null value is used.</returns>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}
